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            <h3 class="mb-0">Cookie实例-保存用户登录时的用户名</h3>
            
            <small class="text-muted">发布于 2016-08-19</small>
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        <article>
            <p>实现一个登录界面,记录用户名的信息,10小时内，不需要重新输入用户名的信息。(请使用Cookie完成)</p>
<p>界面代码如下</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-html" data-lang="html"><span style="display:flex;"><span><span style="color:#75715e">&lt;!DOCTYPE html&gt;</span>&lt;<span style="color:#f92672">html</span>&gt;&lt;<span style="color:#f92672">head</span>&gt;
</span></span><span style="display:flex;"><span>    &lt;<span style="color:#f92672">meta</span> <span style="color:#a6e22e">charset</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;utf-8&#34;</span>&gt;
</span></span><span style="display:flex;"><span>    &lt;<span style="color:#f92672">meta</span> <span style="color:#a6e22e">http-equiv</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;X-UA-Compatible&#34;</span> <span style="color:#a6e22e">content</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;IE=edge&#34;</span>&gt;
</span></span><span style="display:flex;"><span>    &lt;<span style="color:#f92672">title</span>&gt;&lt;/<span style="color:#f92672">title</span>&gt;
</span></span><span style="display:flex;"><span>    &lt;<span style="color:#f92672">link</span> <span style="color:#a6e22e">rel</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;stylesheet&#34;</span> <span style="color:#a6e22e">href</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;&#34;</span>&gt;&lt;/<span style="color:#f92672">head</span>&gt;&lt;<span style="color:#f92672">body</span>&gt;
</span></span><span style="display:flex;"><span>    &lt;<span style="color:#f92672">form</span> <span style="color:#a6e22e">action</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;user.php?a=check&#34;</span> <span style="color:#a6e22e">method</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#39;post&#39;</span>&gt;
</span></span><span style="display:flex;"><span>        u: &lt;<span style="color:#f92672">input</span> <span style="color:#a6e22e">type</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;text&#34;</span> <span style="color:#a6e22e">name</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#39;username&#39;</span> <span style="color:#a6e22e">value</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;&lt;?php echo $username;?&gt;&#34;</span>&gt;&lt;<span style="color:#f92672">br</span>/&gt;
</span></span><span style="display:flex;"><span>        p: &lt;<span style="color:#f92672">input</span> <span style="color:#a6e22e">type</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;password&#34;</span> <span style="color:#a6e22e">name</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#39;password&#39;</span>&gt;&lt;<span style="color:#f92672">br</span>/&gt;
</span></span><span style="display:flex;"><span>        是否保存用户名 &lt;<span style="color:#f92672">input</span> <span style="color:#a6e22e">type</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;radio&#34;</span> <span style="color:#a6e22e">value</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#39;yes&#39;</span> <span style="color:#a6e22e">name</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#39;save&#39;</span>&gt;保存10小时        &lt;<span style="color:#f92672">input</span> <span style="color:#a6e22e">type</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;radio&#34;</span> <span style="color:#a6e22e">value</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#39;no&#39;</span> <span style="color:#a6e22e">name</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#39;save&#39;</span>&gt;不保存&lt;<span style="color:#f92672">br</span>/&gt;
</span></span><span style="display:flex;"><span>        &lt;<span style="color:#f92672">input</span> <span style="color:#a6e22e">type</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;submit&#34;</span> <span style="color:#a6e22e">value</span><span style="color:#f92672">=</span><span style="color:#e6db74">&#34;登录&#34;</span>&gt;
</span></span><span style="display:flex;"><span>    &lt;/<span style="color:#f92672">form</span>&gt;&lt;/<span style="color:#f92672">body</span>&gt;&lt;/<span style="color:#f92672">html</span>&gt;
</span></span></code></pre></div><p>代码如下：</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-php" data-lang="php"><span style="display:flex;"><span><span style="color:#f92672">&lt;?</span><span style="color:#a6e22e">php</span>
</span></span><span style="display:flex;"><span><span style="color:#a6e22e">header</span>(<span style="color:#e6db74">&#39;content-type:text/html;charset=utf-8&#39;</span>);
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>$action <span style="color:#f92672">=</span> <span style="color:#a6e22e">isset</span>($_GET[<span style="color:#e6db74">&#39;a&#39;</span>]) <span style="color:#f92672">?</span> $_GET[<span style="color:#e6db74">&#39;a&#39;</span>] <span style="color:#f92672">:</span><span style="color:#e6db74">&#39;login&#39;</span>;
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">if</span> ($action <span style="color:#f92672">==</span> <span style="color:#e6db74">&#39;login&#39;</span>) {
</span></span><span style="display:flex;"><span>    $username <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;&#39;</span>;
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">if</span> (<span style="color:#a6e22e">isset</span>($_COOKIE[<span style="color:#e6db74">&#39;username&#39;</span>])){
</span></span><span style="display:flex;"><span>        $username <span style="color:#f92672">=</span> $_COOKIE[<span style="color:#e6db74">&#39;username&#39;</span>];
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">require</span> <span style="color:#e6db74">&#39;myLogin.html&#39;</span>;
</span></span><span style="display:flex;"><span>} <span style="color:#66d9ef">elseif</span> ($action <span style="color:#f92672">==</span> <span style="color:#e6db74">&#39;check&#39;</span>) {
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    $username <span style="color:#f92672">=</span> <span style="color:#a6e22e">isset</span>($_POST[<span style="color:#e6db74">&#39;username&#39;</span>]) <span style="color:#f92672">?</span> $_POST[<span style="color:#e6db74">&#39;username&#39;</span>] <span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;&#39;</span>;
</span></span><span style="display:flex;"><span>    $pwd <span style="color:#f92672">=</span> <span style="color:#a6e22e">isset</span>($_POST[<span style="color:#e6db74">&#39;password&#39;</span>]) <span style="color:#f92672">?</span> $_POST[<span style="color:#e6db74">&#39;password&#39;</span>] <span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;&#39;</span>;
</span></span><span style="display:flex;"><span>    $is_save <span style="color:#f92672">=</span> <span style="color:#a6e22e">isset</span>($_POST[<span style="color:#e6db74">&#39;save&#39;</span>]) <span style="color:#f92672">?</span> $_POST[<span style="color:#e6db74">&#39;save&#39;</span>] <span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;&#39;</span>;
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">if</span> ($pwd <span style="color:#f92672">==</span> <span style="color:#e6db74">&#39;123&#39;</span>) {<span style="color:#75715e">//默认密码为123
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>        <span style="color:#66d9ef">if</span> ($is_save <span style="color:#f92672">==</span> <span style="color:#e6db74">&#39;yes&#39;</span>) {<span style="color:#75715e">//如果点击保存用户名，则设置cookie
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>            <span style="color:#75715e">//设置cookie,保存用户名
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>            <span style="color:#a6e22e">setcookie</span>(<span style="color:#e6db74">&#39;username&#39;</span>,$username,<span style="color:#a6e22e">time</span>() <span style="color:#f92672">+</span> <span style="color:#ae81ff">30</span>);
</span></span><span style="display:flex;"><span>            $info <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;恭喜登录成功，保存了你的用户名到cookie&#39;</span>;
</span></span><span style="display:flex;"><span>            <span style="color:#66d9ef">require</span> <span style="color:#e6db74">&#39;myLoginOk.html&#39;</span>;
</span></span><span style="display:flex;"><span>        }<span style="color:#66d9ef">elseif</span> ($is_save <span style="color:#f92672">==</span> <span style="color:#e6db74">&#39;no&#39;</span>){<span style="color:#75715e">//点击不保存用户名，如果cookie中有数据，则删除cookie
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>            <span style="color:#66d9ef">if</span>(<span style="color:#a6e22e">isset</span>($_COOKIE[<span style="color:#e6db74">&#39;username&#39;</span>])){
</span></span><span style="display:flex;"><span>                <span style="color:#a6e22e">setcookie</span>(<span style="color:#e6db74">&#39;username&#39;</span>,<span style="color:#e6db74">&#39;&#39;</span>,<span style="color:#a6e22e">time</span>() <span style="color:#f92672">-</span> <span style="color:#ae81ff">1</span>);
</span></span><span style="display:flex;"><span>                <span style="color:#a6e22e">unset</span>($_COOKIE[<span style="color:#e6db74">&#39;username&#39;</span>]);
</span></span><span style="display:flex;"><span>            }
</span></span><span style="display:flex;"><span>            $info <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;恭喜登录成功，删除你的用户名cookie&#39;</span>;
</span></span><span style="display:flex;"><span>            <span style="color:#66d9ef">require</span> <span style="color:#e6db74">&#39;myLoginOk.html&#39;</span>;
</span></span><span style="display:flex;"><span>        }<span style="color:#66d9ef">else</span> { <span style="color:#75715e">//如果什么都没选择,则直接显示登陆成功
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>            $info <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;恭喜登录成功&#39;</span>;
</span></span><span style="display:flex;"><span>            <span style="color:#66d9ef">require</span> <span style="color:#e6db74">&#39;myLoginOk.html&#39;</span>;
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    }<span style="color:#66d9ef">else</span>{<span style="color:#75715e">//密码不正确
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>        $info <span style="color:#f92672">=</span> <span style="color:#e6db74">&#39;用户名,密码不正确&#39;</span>;
</span></span><span style="display:flex;"><span>        <span style="color:#66d9ef">require</span> <span style="color:#e6db74">&#39;myloginError.html&#39;</span>;
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>}
</span></span></code></pre></div>
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